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Explain carefully why we need two roundtrips, not just one, not just dispatch and roundtrip, but two roundtrips after creating the wl_registry object. v2: Explain what initial events are, and that this is a general technique. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk> Reviewed-by: Marek Chalupa <mchqwerty@gmail.com>